Apron and ejector control for carry-type scrapers



5 Sheets-Sheet 1 Sept. 4, 1951 D. E. MURRAY APRON AND EJECTOR CONTROL FOR CARRY-TYPE SCRAPERS Filed May 28, 1946 APRON AND EJECTOR CONTROL FOR CARRY-TYPE SCRAPERS 3 Sheets-Sheet- 2 Filed May 28, 1946 0 INVENTOR .ZZEMu rray Q 'mmz ATTORNEYS p 4, 1951 D. E. MURRAY 2,567,118

APRON AND EJECTOR CONTROL FOR CARRY-TYPE SCRAPERS Filed may 28, 1946 s Sheets-Shag; a

INVENTOR 1 I 3.1;: Murra y BY M ATTORNEYS Patented Sept. 4, 1951 UNITED STATES PATENT OFFICE APRON AND EJEICTOR CONTROL FOR CARRY-TYPE SCRAPERS Donald E. Murra y Modesto, Calif. Application'May 28, 1946, Serial No. 672,823

4 Claims. 1

This invention relates to earth digging and carrying equipment and is directed to a carry type scraper for digging; loading, transporting and dumping earth.

The object of the invention is to provide a type of scraper in which the several operating parts are preferably controlled through a very simplified type of hydraulic cylinder assembly and in which the cycle of loading, transporting and emptying the scraper may be carried out and controlled by the driver of the tractor or other prime mover connected to the scraper.

A further object of the invention is to produce a practical device and one which will be exceedingly effective for the purpose for whichit is designed. f

These objects are accomplished by means of such structure and relative arrangement of'parts as will fully appear by a perusal of the following specification and claims. v

In the drawings:

Figure 1 is a longitudinal sectional 'view through the scraper showing the parts as they appear when the scraper has been loaded andfis ready for transport.

Figure 2 is a side elevation showing the front Y apron or gate of the scraper raised and in the position it assumes before the tail gate of the scraper has been raised to complete the dumping of the load from the scraper. I Figure 3 is a longitudinal sectional view show ing the position of the parts at the time the load in the scraper has been completely dumped.

Figure 4 is a diagrammatic outline of the cable system which is operable to consecutively first raise the front apron and then lift the tail gate to accomplish the dumping of the load from" the scraper. i V

Figure 5 is a fragmentary perspective view showing the relative positions of two of thelopcrating sheaves of the device. 5

Referring now more particularly to thechar.

acters of reference on the drawings, thenumeral I designates the rear main frame of thescraper on which are carried spaced side plates 2. The frame I is supported on rear wheels 3 and is turnable about the axis 4 thereof for the purpose of raising and lowering the side walls 2 with respect to the ground.

Toward but spaced somewhat from the forward end of the side walls 2 is a scraping or cutting blade 5 which projects between the side walls 2 and extends to a point a short distance below the lower edgeofsaid, side walls. j Pivoted immediately back of the blade il as at 6"i s a ppe ea iqa bSPIZEQHLfiQQPQQKRlilE it. 1 and 8, respectively, which with the side plates 2 formprojecting forwardly from the front endof the side walls 2 are straps I3. I4 is a draft yoke having spaced apart and diverging arms I5 at its lower end and which arms l5 are pivotally connected to the straps I3 as at It. The draft yoke I4 is supported by a front Wheel truck ll projecting forwardly from which is a draft bar it for connection with a. tractor or other prime mover. Pivotally connected adjacent the upper portion of the yoke I4, as at I9, is a hydraulic cylinder and piston unit 20; the projecting piston rod 2I of which is pivotally connected, as at 22, to a bracket 23 projecting forwardly from'the upper side of the arch frame I2. Fixed rigidly to and projecting from the top of the arch frame I2 is a hydraulic cylinder and piston unit 24 which at its other end is connected to a supporting bracket 25 upstanding from the cross beam II. On the outer end of the piston rod 26 0f this unit is a sheave housing 21 in which 'is journaled a sheave 28. Projecting from the top of the arch frame I2 is a sheave housing2s in which is journaled a sheave 3B. Spaced from the housing 29 is a similar housing 3I projecting from the arch frame I2 and in which is journaled a sheave 32. On a crossbeam 33 secured to' the arch frame I2 at a point below the top of the arch is still another sheave housing 34 in which is journaled a sheave 35. Apron arms 36 are pivoted to the side plates 2, as at 31, and project forwardly beyond the free arms of said'side plates 2 and support a frontapron 33 which extends, when in lowered position, between the side plates 2 and against the blade 5 in order to'form a front closure for the scraper bowl. A cable 39' is fixed adjacent the top edge of the apron 38 and extends upwardly over the sheave 38 then around the sheave 28 and over the sheave 32 and then under the sheave 35 and hence to a point of connection with the upper edge 'of the plate 8.

Guide rod 40 is fixed at one end to the hous-' ing 3| and a guide sleeve M is fixed to the housing 2'! and the rod 40 telescopes into the sleeve 4|. A rod 42 is pivoted to the top edge of the apron 38, as at 43,'and is slidably mounted through a sleeve 44 pivotedona bracket 4.515e-v cured to the cross beam 33. A sheave 46 is journaled in the bracket 45 and a sheave 4'! is journaled in a sheave housing 48 secured on the cross beam H. A cable 49 is fixed to the upper end of the rod 42, as at B, and extends downwardly around the sheave 46 and then around the sheave 38 and is hence fixed to the upper end of the sleeve 4|. A suitable source of hydraulic pressure will in practice be provided on the tractor or other convenient place and controlled conduits will lead therefrom to the two hydraulic cylinders 29 and 24. These are conventional, however, and it is not deemed necessary to show the same herein for the operation of the scraper.

In Fig. 2 the scraper is shown with the front apron 38 raised to clear the front end of the scraper bowl. When in this position and the digging operation is to be carried out, the'pressure is introduced into th cylinder 26 to move the piston rod 2| downwardly. This action causes the connection between the members l3 and I5 to hinge about a point is to lower the scraper bowl 2l8 to a position to bring the cutting blade 5 into the ground into cutting position, the scraper bowl then moving about the axis 4 of the wheels 3 as a turning axis. The scraper is then drawn forward, the blade 5 cuts into the earth and scrapes and loosens the same, and as it is scraped, the dirt moves back into and fills the scraper bowl 2-'|-8. Pressure is then admitted to the cylinder 24 to move the piston rod upwardly. This slackens the cable 39 and allows the apron 38 to drop downwardly toward a closed position. The rod 42, at this time slides downwardly through the sleeve 44 as the piston rod 26 thus moves upwardly; the sleeve 4| also moves upwardly sliding over the guide rod 48. This action causes the said sleeve 4| to take up any slack occurring in the cable G9 occasioned by the downward movement of the rod 42. Just as the apron 38 approaches closed position over the scraper bowl the slack in the cable 49 is all taken out so that the last short movement of the sleeve ll pulls the cable 49 taut and exerts a pulling action downwardly on the rod 42 at the point 59 thus forcedly and positively closing the apron 38 against the blade 5 and holding it in such closed position.

Reversed pressure is then applied to the cylinder 20 causing the piston rod 2| to move outwardly and exerting pressure upwardly against the arch frame I2 and lifting the entire scraper bowl and apron with the load of dirt therein upwardly and into transport position.

The loaded scraper is then conveyed to the point where the load is to be emptied. When this point is reached pressure is admitted to the cylinder 24 to drive the piston rod 26 outwardly and downwardly. This action tends to extend the cable 39 which action at first takes up the slack in the cable and then raises the apron 38 moves over the guide 40 so as to permit of the up-' ward movement of the rod 42 and said cable .9, the slackened cable 49 being shown in Fig. 3.

From the foregoing description it will be readily seen that there has been produced such a de-- 4 vice as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimd as new and useful and upon which Letters Patent is desired:

1. A scraper comprising a scraper bowl which includes a rear frame and a front frame and side plates connecting the frames, a load ejectin member movable forwardly between the side plates, a load retaining apron positioned in front of the side plates and pivoted for swinging movement in a vertical plane, a hydraulic cylinder and piston unit rigidly connected to said frames and extending longitudinally of the scraper bowl, such unit including a piston rod projecting beyond one end of the cylinder, a sheave journalled in the outer end of the piston rod, a pair of sheaves mounted on the front frame in spaced relation to each other, a third sheave journalled on said front frame in a plane below said pair of sheaves, a cable fixed to the apron and extending CV61 one of said pair of sheaves thence around the sheave onthe piston rod, hence over the other of said pair of sheaves thence under said third sheave, and means connecting the cable with the ejecting member. I

2. A combination as in claim 1 and including therewith a means for effecting a positive pressure against the apron as it approaches its lowermost position.

3. A combination as in claim 1 and including therewith a means for effecting a positive pressure against the apron as it approaches its lowermost position, such latter means including an upstanding rod pivoted on the apron, a sleeve journaled on the front frame, the rod being slidable through the sleeve, and means for applying pressure to said rod.

4. A scraper comprising a scraper bowl which includes a front frame and a rear frame, a load retaining apron positioned in front of the bowl and pivoted for swinging movement in a vertical plane, cable means to so swing said apron, an upstanding rod pivoted to the apron, a sleeve journaled on the front frame, the rod being slidable through the sleeve, a hydraulic cylinder and piston unit mounted on the frames and including a projecting piston rod, a guide pin fixed to e DONALD E. MURRAY.

REFERENCES one!) The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,181,403 Kolberg Nov. 28, 1939 2,411,280 Lichtenberg et al. Nov. 19, 1946 2,411,688 Keim et a1 Nov. 26, 1946 

